Find the side length of the triangle — task. Mathematics CBSE, Class 10.

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Answer variants:

5.143

4.143

7.143

6.143

In

$\triangle ABC$ ,

$D$ and

$E$ are points of the sides

$AB$ and

$AC$ , respectively. If

$DE \parallel BC$ ,

$\frac{AD}{DB} = \frac{2}{5}$ and

$AC = 8.6 \ cm$ , then find

$EC$ .

The value of

$EC$ is

$cm$ .

$1$

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